TED: Voltage Sag

Not sure if its meaningful, but there is a pretty strong voltage sag when my house draws a lot of power from the Dominion system:



The R^2 of the relationship is 58% and the T-stat for the KW variable is 218 - I'd consider this significant. This graph was generated in 'R' using the following commands:

plot(ted$KW, ted$VRMS, xlim=c(0,20), ylim=c(117,123), pch=3)
lines(ted$KW, lm(ted$VRMS ~ ted$KW)$fitted.values, col="red")


In any event, the voltage ranges appear to be well-within the current standards (if Wikipedia is correct):

In the United States and Canada, national standards specify that the nominal voltage at the source should be 120 V and allow a range of 114 to 126 V (-5% to +5%). Historically 110, 115 and 117 volts have been used at different times and places in North America. Main power is sometimes spoken of as "one-ten"; however, 120 is the nominal voltage.